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| <template>
<button v-bind="conditionalLinkProps"
I :is="componentType"
:class="classList"
E :data-toggle="isToggle ? 'button' : null"
:aria-pressed="ariaPressed"
:type="btnType"
:disabled="disabled"
:tabindex="(disabled && componentType !== 'button') ? '-1' : null"
@focusin.native="handleFocus"
@focusout.native="handleFocus"
@click="onClick">
<slot></slot>
</button>
</template>
<script>
import bLink from './link.vue';
import { omitLinkProps, props as originalLinkProps, computed } from '../mixins/link';
import { assign } from '../utils/object';
// Grab a fresh object of link props (omitLinkProps does this)
// less the 'href' and 'to' props
// that we will reconstruct without any defaults
// so our computed 'componentType' functions properly
const linkProps = assign(omitLinkProps('href', 'to'), {
href: { type: originalLinkProps.href.type },
to: { type: originalLinkProps.to.type }
});
export default {
components: { bLink },
computed: {
linkProps: computed.linkProps,
classList() {
return [
'btn',
this.btnVariant,
this.btnSize,
this.btnBlock,
this.btnDisabled,
this.btnPressed
];
},
componentType() {
return (this.href || this.to) ? 'b-link' : 'button';
},
btnBlock() {
return this.block ? 'btn-block' : '';
},
btnVariant() {
return this.variant ? `btn-${this.variant}` : `btn-secondary`;
},
btnSize() {
return this.size ? `btn-${this.size}` : '';
},
btnDisabled() {
return this.disabled ? 'disabled' : '';
},
btnType() {
return (this.href || this.to) ? null : this.type;
},
isToggle() {
return this.pressed === true || this.pressed === false;
},
btnPressed() {
return this.pressed ? 'active' : '';
},
ariaPressed() {
if (this.isToggle) {
// Add aria-pressed state
return this.pressed ? 'true' : 'false';
}
// Remove aria-pressed attribute
return null;
},
conditionalLinkProps() {
return this.componentType === 'button' ? {} : this.linkProps;
}
},
// merge our prepared link props with button props
props: assign(linkProps, {
block: {
type: Boolean,
default: false
},
disabled: {
type: Boolean,
default: false
},
size: {
type: String,
default: null
},
variant: {
type: String,
default: null
},
type: {
type: String,
default: 'button'
},
pressed: {
// tri-state prop: true, false or null
type: Boolean,
default: null
}
}),
methods: {
onClick(e) {
if (this.disabled) {
e.stopPropagation();
e.preventDefault();
} else {
this.$emit('click', e);
if (this.isToggle) {
// Emit .sync notification about pressed prop state changing
this.$emit('update:pressed', !this.pressed);
}
}
},
handleFocus(evt) {
if (this.isToggle) {
if (evt.type === 'focusin') {
evt.target.classList.add('focus');
I} else if (evt.type === 'focusout') {
evt.target.classList.remove('focus');
}
}
}
}
};
</script>
|